$B_2Cl_4 \rightarrow B_8Cl_8, B_9Cl_9, B_{10}Cl_{10}, B_{11}Cl_{11}$ and $B_{12}Cl_{12}$
$Ga^{11}$
$Ga_2X_6^{2-}$ (X=Cl, Br or I)
$GaX_4^-$
$B_nH_{n+4} \quad B_nH_{n+6}$
$2BH_3 \rightarrow B_2H_6$
$4BF_3+3LiAlH_4 \rightarrow 2B_2H_6+3Li[AlF_4]$
$2B_2H_6 \xrightarrow {100-120^o C} B_4H_{10}+H_2$
$5B_2H_6 \xrightarrow {180-220^o C} 2B_5H_9+6H_2$